A positive displacement metering systems (PDMS) using a water fill cylinder (WFC) is provided. It will replace or be paired with an existing conventional water meter. The primary advantage of the PDMS is its ability to detect and measure “micro” flow rates. The PDMS allows the water utility to bill for all water consumed by the customer. The PDMS will only allow 100% detectable flow rates to pass through the water meter attached. flow rates which are undetectable, or only partially detectable will be accounted for. The PDMS will report the sum of the two meters to the utility. The PDMS will also function as a leak detection device and water conservation tool, will perform automatic or remotely controlled functions like turning off water, when a high flow leak is detected, and report directly to the water utility or tenant of the property being monitored.
|
9. A method for making a positive displacement metering system comprising:
a) providing a water fill cylinder assembly, a water meter, and a primary valve, wherein when said primary valve is closed, water is diverted to said water fill cylinder assembly, and when said primary valve is open, water freely flows through said water meter to a property being monitored;
b) providing a piston having a magnet thereon, located within said water fill cylinder assembly;
c) providing two or more sensors mounted on said cylinder assembly;
wherein water flows into said cylinder assembly and moves said piston, compressing said spring, whereby said two or more sensors detect a position of said magnet on said piston and a timing of a movement of said piston, and thereby measure a true displacement volume and rate of flow; and
wherein said two or more sensors includes three sensors including an override sensor, and thereby times the movement of said piston for measuring the true displacement volume and rate of flow.
5. A positive displacement metering system comprising:
a) a water fill cylinder assembly, a water meter, and a primary valve, wherein when said primary valve is closed, water is diverted to said water fill cylinder assembly, and when said primary valve is open, water freely flows through said water meter to a property being monitored;
b) said water fill cylinder assembly having a piston and a spring located within said cylinder assembly;
c) said piston having a magnet thereon, located within said water fill cylinder assembly;
d) two or more sensors mounted on said cylinder assembly;
wherein water flows into said cylinder assembly and moves said piston, compressing said spring, whereby said two or more sensors detect a position of said magnet on said piston with respect to said water fill cylinder assembly and a timing of a movement of said piston, and thereby measures a true displacement volume and rate of flow; and
wherein said two or more sensors includes three sensors including an override sensor, and thereby times the movement of said piston for measuring the true displacement volume and rate of flow.
6. A method for making a positive displacement metering system comprising:
a) providing a water fill cylinder assembly, a water meter, and a primary valve, wherein when said primary valve is closed, water is diverted to said water fill cylinder assembly, and when said primary valve is open, water freely flows through said water meter to a property being monitored;
b) providing a piston having a magnet thereon, located within said water fill cylinder assembly;
c) providing two or more sensors mounted on said cylinder assembly;
wherein water flows into said cylinder assembly and moves said piston, compressing said spring, whereby said two or more sensors detect a position of said magnet on said piston and a timing of a movement of said piston, and thereby measures a true displacement volume and rate of flow;
wherein said water fill cylinder assembly and said two or more sensors are connected to and in communication with a data acquisition unit and a control panel, whereby said data acquisition unit uses acquired timing data to determine rate of flow; and
wherein said data acquisition unit and the control panel is in communication with said two or more sensors and can switch between standard operation logic and small leak detection logic.
1. A positive displacement metering system comprising:
a) a water fill cylinder assembly, a water meter, and a primary valve, wherein when said primary valve is closed, water is diverted to said water fill cylinder assembly, and when said primary valve is open, water freely flows through said water meter to a property being monitored;
b) said water fill cylinder assembly having a piston and a spring located within said cylinder assembly;
c) said piston having a magnet thereon, located within said water fill cylinder assembly;
d) two or more sensors mounted on said cylinder assembly;
wherein water flows into said cylinder assembly and moves said piston, compressing said spring, whereby said two or more sensors detect a position of said magnet on said piston with respect to said water fill cylinder assembly and a timing of a movement of said piston, and thereby measures a true displacement volume and rate of flow;
wherein said water fill cylinder assembly and said two or more sensors are connected to and in communication with a data acquisition unit and a control panel, whereby said data acquisition unit uses acquired timing data to determine rate of flow; and
wherein said data acquisition unit and the control panel is in communication with said two or more sensors and can switch between standard operation logic and small leak detection logic.
2. The positive displacement metering system according to
3. The positive displacement metering system according to
4. The positive displacement metering system according to
7. The method of making a positive displacement metering system according to
8. The method of making a positive displacement metering system according to
|
|||||||||||||||||||||||||||||||||||||||||
This application provides a Positive Displacement Metering System (PDMS) using a unique Water Fill Cylinder (WFC) in the preferred embodiment with two or more sensors that will replace the conventional water meter or paired with an existing water meter. In the alternate embodiment with three sensors it will safely indicate any minor or major leakage in the water system in homes and businesses and automatically shut water off if necessary along with notifying the responsible person for the property being monitored.
The preferred embodiment of the PDMS can play a critical role in how water use is monitored by a utility, and in turn billed to the end user. Since the original water meters inception, there has always been, and continues to be, inaccuracy associated with very low water flow rates.
There are two general types of water meters on the market, mechanical and solid state. These meters are accurate and have served our nations communities well for many years, but these meters have limitations, they are only accurate inside a given range of flow. While these ranges are large, and cover almost all water use, very small flow still remain undetectable to both solid state and mechanical meters.
The accuracy of these existing meters is dependent on the type of water meter. Today's modern solid state water meters are extremely accurate, and can measure water flow inside its given range with close to 100% accuracy. The best solid state meter can accurately measure down to 0.03 GPM (0.03 GPM on a ¾ in pipe, this value jumps to 0.11 GPM for a 1 inch pipe). The accuracy of the PDMS preferred embodiment does not change with an increase in pipe diameter. They have proven to be reliable under a wide range of temperatures, pressures and hold up well under harsh environments. Further, these meters have no moving parts which greatly increase their reliability. The down side to this new technology is cost; many communities are hesitant to convert to this new technology for this reason.
Mechanical water meters, when measuring low flow, are the inverse of their solid state counterpart. These meters are inexpensive, however at lower flow ranges, they are inaccurate. While a solid state meter can report with a high degree of accuracy from 0.03 GPM (on a ¾ in pipe) and greater, the best mechanical water meter on the market today, will not achieve 100% accuracy until about 0.25 GPM.
Water is revenue, you can't bill for what you can't detect. Even though the low end range of detectable flow is quite good for a solid state meter, a large amount of water can still pass by the meter undetected. A flow rate of 0.03 GPM (at or below for a solid state meter is undetectable) is equal to 1.8 gallons per hour, that's a maximum of more than 43 gallons per day or 15,700 gallons per year, per customer, which the utility cannot bill for.
The revenue lost for water utility's using mechanical meters is significantly worse. The accuracy of a mechanical water meter at lower flow rates decreases with a decrease in water flow (starting at close to 100% accuracy for the best mechanical meter at 0.25 GPM, and an undetectable rate of 0.05 GPM or less). If the average flow rate were 0.14 GPM, only about 1 of this water flow would be accounted for by a mechanical water meter. That equates to more than 100 gallons of water per day that passes through the meter undetected. Annually that is more than 35,000 gallons of water per year, per customer that the utility cannot bill for.
When this data is further broken down, specifically when we take a closer look at the undetectable range, we come up with the following; 0.05 GPM is 2,160 Gallons over 30 Days, or 25,920 Gallons per year from one meter. In a community of 10,000, this could amount to 259,200,000 gallons per year (795 Acre Feet) of unbilled revenue.
The question we must ask is how many mechanical meters have leaks at or below 0.05 GPM? We do not know, as a mechanical meter cannot measure flow rates below 0.05 GPM. What we do know is that (according to the American Water Works Association) 16% of a meters usage occurs at low flow rates (less than 1 GPM) and a mechanical meter measures only a percentage of flow below ¼ GPM. This inability to record flow results in a significant loss of revenue for the utility.
For years, the insurance industry, home owners and businesses have incurred millions of dollars in losses due to unnecessary water damage. Typically the damage done is created by a small leak (such as a pinhole leak inside of a wall or slab) or a catastrophic failure in a pressurized pipe network (a burst pipe or washing machine hose failure). Presently, the most efficient way to guard against this type of leak is by continuously monitoring water flow into the structure. A tell tail sign of any water leak is continuous water flow, be it large (such as a burst water hose or pipe) or small (a pinhole leak in a copper pipe, in the slab or wall of the structure).
The purpose of the alternate embodiment of the PDMS is twofold. First, to warn of a leak condition (be it large or small) and turn off the flow of water to preventing damage to the property. And second, to indicate the amount of water being consumed by the property resulting in a more efficient use of water. Each of these tasks can be accomplished by actively monitoring the entire structure at all times.
The alternate embodiment of the PDMS is a system that monitors pressurized water flow into a home or building at all times, and when a leak is detected, will automatically shutoff water flow into the structure, and notify the party responsible.
At the present time, there are two major manufactures of continuously monitoring, whole structure leak detection systems. Both work well, but have large drawbacks, namely cost and the inability to detect very low rates of water flow, (neither unit can accurately measure, nor detect small flow rates, thus the existing units have no way of accurately measuring the amount of water leaked into the structure).
The PDMS alternate embodiment will provide the responsible party with four critical pieces of information:
In this respect, before explaining at least one embodiment of the Positive Displacement Metering Systems in detail it is to be understood that the design is not limited in its application to the details of construction and to the arrangement, of the components set forth in the following description or illustrated in the drawings. The Positive Displacement Metering Systems consisting of the preferred embodiment using a unique Water Fill Cylinder (WFC) with two or more sensors and the alternate embodiment using three sensors is capable of other embodiments and of being practiced and carried out in various ways. In addition, it is to be understood that the phraseology and terminology employed herein are for the purpose of description and should not be regarded as limiting. As such, those skilled in the art will appreciate that the conception, upon which this disclosure is based, may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present design. It is important, therefore, that the claims be regarded as including such equivalent construction insofar as they do not depart from the spirit and scope of the present application.
The principle advantage of the Positive Displacement Metering System in the preferred embodiment with two or more sensors, is to give a precise rate of flow, a measurement of total water consumed, leak alert information and emergency action (if so programmed by the utility) and report it to the local water authority.
Another advantage of the Positive Displacement Metering System in the preferred embodiment, is that the device can be used with any type of water meter (be it solid state or mechanical), for any size pipe, and will monitor all flow rates in conjunction with the specified water meter attached to the PDMS preferred embodiment. The PDMS preferred embodiment tracks and records water flow inside the manufacturer specified flow rate envelope for the given water meter attached to the PDMS. When the lower limit of the water meters flow rate envelope has been reached (a rate of flow which the water meter manufacturer has specified as undetectable or inaccurate), the PDMS preferred embodiment will track all flow rates equal to or less than the manufacturers specifications of the water meter used with the PDMS, and add these lower rates of flow to the flow measured by the water meter attached to the PDMS preferred embodiment. The sum of these two meters (the water meter attached to the PDMS and the PDMS WFC cycle count) is a very accurate summation of the total amount of liquid to pass through the PDMS preferred embodiment. In very simple terms, the PDMS preferred embodiment expands the flow rate envelope of any water meter attached to it.
Another advantage of the Positive Displacement Metering System in the preferred embodiment is that the leak detection capability of the PDMS preferred embodiment can be removed, thus allowing the PDMS preferred embodiment to function solely as a water meter.
Another advantage of the Positive Displacement Metering System in the preferred embodiment and alternate embodiment is having a replaceable particulate screen located on the intake line before one or more of the Water Fill Cylinder Assemblies.
Another advantage of the Positive Displacement Metering System is that in the preferred embodiment and alternate embodiment the sensors are moveable. This allows the user to adjust X and Y values, which in turn controls when the PV will open, and the associated water meter becoming active. This feature assures the user that the associated water meter will only be functioning inside of the manufacturers associated flow envelope, thus ensuring the highest possible degree of accuracy for the PDMS and its associated water meter. By adjusting the Y value, the user can set the threshold of exactly how sensitive he would like the system to be, in other words, set the limitations of when the system will alarm for a very low flow value.
Another advantage of the Positive Displacement Metering System in the preferred embodiment or the alternate embodiment is that the unit is relatively inexpensive and simple to install.
Another advantage of the Positive Displacement Metering System is that in the preferred embodiment or alternate embodiment they can consist of multiple water fill cylinders in a redundant operation.
Another advantage of the Positive Displacement Metering System in the alternate embodiment is being able to know that you have complete control of the water entering into your home or place of business.
Another advantage of the Positive Displacement Metering System in the alternate embodiment is knowing if there is a leak, either small or large, you will be notified and the water can be shut off automatically.
Another advantage of the Positive Displacement Metering System in the alternate embodiment is knowing that if the tenant of the property is away, he or she will automatically receive notification of a leak condition, and action can be taken by the tenant via remote internet access to the PDMS, should it be necessary.
Another advantage of the Positive Displacement Metering System in the alternate embodiment is being able to monitor and control the system from the inside the building being monitored with the PDMS alternate embodiment interface.
Another advantage of the Positive Displacement Metering System in the alternate embodiment is that the PDMS alternate embodiment interface can be directly wired to the WFC Water Fill Cylinder or it can effectively function as a wireless system.
Another advantage of the Positive Displacement Metering System alternate embodiment is that with the PDMS interface, you can keep continuous track of your water usage, independent of the water utilities water metering system.
Another advantage of the Positive Displacement Metering System preferred or alternate embodiment, is that the Primary Valve (PV) can be operated manually should the automatic system malfunction, thus insuring that the property tenant is never in a “no water” situation.
Another advantage of the Positive Displacement Metering System is the system can operate as a leak detection system only, and function without the water meter. This would be accomplished by counting cycles inside of a given time range. When the cycle rate becomes high enough, which would represent a given flow rate, the system would alarm. Under Standard Flow, the unit would open the PV as it does in the PDSM preferred and alternate embodiments, and would close the PV in conjunction with time. If the PV closes during Standard Use water flow, the piston will move rapidly across from its home position to S2 and the PV would immediately open again. Water in this transitional phase would be provided by the flooded WFC.
The PDMS preferred embodiment is a very simple device, it is inexpensive and highly accurate at all rates of flow. When the PDMS preferred embodiment is paired with an existing water meter, be it solid state or mechanical, the rate of flow along with the total amount of water to flow through the PDMS is accounted for, recorded and reported. Now communities which cannot afford the cost of solid state meters can retrofit the PDMS preferred embodiment with their existing mechanical meters, and when combined, have a reporting system which is more accurate and more affordable than any standalone solid state meter.
The time required to recoup the cost of the PDMS preferred embodiment is greatly reduced in comparison to the replacement of an existing mechanical meter with a solid state meter. First, the overall cost of the PDMS preferred embodiment system is considerable lower than a solid state meter, (further when the PDMS is retrofitted to an existing water meter, the cost is even lower). Second, when the PDMS preferred embodiment is paired with a mechanical meter, the undetectable range is eliminated, allowing the utility to bill for the true total amount of water used.
The PDMS preferred embodiment and the PDMS alternate embodiment collect and operate in a similar manner, but how the information is distributed and acted upon is different. Example:
The water utility can program the PDMS preferred embodiment to shut-off water or be advised of an abnormal condition under a predetermined set of leak detection circumstances.
A rate of flow equal to ¼ GPH running for 12 hours (note that any flow rate and any length of time can be programmed) could trigger an “Abnormality Alert”. The utility could then notify the customer and advise them of the possible leak condition, or the primary valve (PV) could be programmed to shut off at a given low flow rate. A high flow rate example would be a rate of flow equal to Standard Use (a shower, a flushing toilet etc.) running for 2 hours or more could trigger PDMS preferred embodiment to shut off. This condition would be immediately reported to the water authority, and the customer notified of the potential high rate of flow leak condition.
The information gathered by the PDMS preferred embodiment is conveyed to the applicable water authority via an AMR (Automatic Meter Reader). This is a widely accepted technology used by many water, gas and electric utilities. AMR technologies include handheld, mobile and network technologies based on telephone platforms (wired and wireless), radio frequency (RF), or power-line transmission.
The PDMS preferred embodiment does not have an interface, as the unit does not report to the occupant of the property being monitored. The PDMS alternate embodiment Interface has been replaced with a DAU or Data Acquisition Unit. The function of the DAU is to collect data (T1 and T2 time, piston position via sensors, position of PV, cycle count, flow rate and the total water passed through the Flow Meter etc.), calculate basic information derived from this data (total water consumed, leak rate of flow, total amount of water to leak into a property, etc.) and issue commands (manipulation of the PV, communication with the AMR). Additionally, the DAU can be programmed by the utility to preform functions in association with water usage, similar to the Home and Away functions of the PDMS (LAS) Interface.
The PDMS preferred embodiment can have additional sensors added to the Water Fill Cylinder (WFC) Assembly; these sensors are placed at a distance of roughly 1 inch apart and are referred to as WM 1, 2 and 3. T1 time is evaluated each time the piston passes WM 1, 2 and 3. This time is compiled, totalized and recorded by the DAU along with the cycle count. The calculation of T1 and T2 time remains the same, as well as the override function of sensor OR1.
The diameter of the cylinder in the PDMS preferred embodiment can be reduced to allow the piston to move a greater distance with the same amount of water displacement. With greater movement comes greater accuracy.
The PDMS preferred embodiment can send and receive commands and transmit data via the AMR. The commands may include, but are not limited to the remote operation of the PV (Primary Valve). This function would allow the water utility or other responsible party to remotely govern water flow in any situation the responsible party deems necessary.
The PDMS preferred embodiment is not limited by pipe diameter. The system will work accurately on large diameter pipe (supplying water to a large office building or community) and small diameter pipe (supplying water to a single family residence or apartment).
In a low flow situation, the PDMS preferred embodiment piston begins movement off of A1. At S1, T1 time begins; this is the same logic which runs the standard WFC of the alternate embodiment of the PDMS. When the piston reaches S2, T1 time is evaluated, and the appropriate logic is assigned to the water flow situation. The PV opens, the piston returns to A1, one cycle is counted and the process begins again. Should a low flow condition be detected, and it is interrupted by standard water use, then the override sensor would redirect the PDMS preferred embodiment to the correct logic. This is the same set of logic commands which run the alternate embodiment of the PDMS.
Should the piston be in motion due to low flow and then stop, the PDMS preferred embodiment logic will not record the given flow rate. Should the OR1 sensor be activated due to Standard Use water flow when the piston is stopped mid cycle, the PDMS preferred embodiment will count the cycle, but dismiss the flow data. The PDMS preferred embodiment takes the place of the traditional water meter and it is not installed inside of the building.
The PDMS preferred embodiment is capable of all that the PDMS alternate embodiment is capable of, but the data produced is reported directly to the governing water utility. For this reason, the PDMS Water Meter does not have interface, rather it has a Data Acquisition Unit (DAU).
The PDMS preferred embodiment gives the water utility options it never had before. Now a water utility can monitor flow rates that were previously undetectable, or measured with a high degree of inaccuracy and accurately bill for them. Additionally the utility can detect, shut-off and automatically report a potentially damaging leak. With the ability to retro-fit the PDMS unit onto existing water meters, the PDMS preferred embodiment makes all of this possible at a very economical cost to the municipality.
There are two primary components which comprise the alternate embodiment of the PDMS, namely, the Water Fill Cylinder (WFC) and the PDMS interface. The WFC holds approximately 1/20th of a gallon of water. Attached to opposite sides of the cylinder are endcaps which house in flow and out flow ports. Inside the cylinder is a solid piston and a return spring, it is important to note that water does not flow through the cylinder. Outside of the cylinder is the primary water line, which attaches directly to the inlet and outlet ports of the cylinder. Between these two ports is a bypass water line. Mounted on this line are a solenoid shutoff valve and a water meter.
The PDMS preferred embodiment can be powered in several different ways. The unit can be hard wired to the property being monitored, and backed up by a 24 VDC battery which will provide power to the unit in-case of a power interruption. In warm climates, the unit can use a combination of a battery and a solar panel placed on top of the water meter housing. Typically this housing is a concrete box type structure. The box is buried, so as to leave the top of the enclosure exposed. This allows entry into the enclosure to service the unit, and is also where the solar panel is placed. The solar panel provides a trickle charge to the 24 VDC battery, which powers the unit.
The PDMS alternate embodiment is a very simple device; it is inexpensive and highly accurate at all rates of flow and all pipe diameters. When the PDMS alternate embodiment is paired with an existing water meter, be it solid state or mechanical, the rate of flow, in all respects, from zero to the water meters maximum rate is accounted for.
Both the PDMS preferred and alternate embodiment are capable of monitoring, recording, reporting and taking action against a leak condition. Further the PDMS preferred and alternate embodiment are not limited to water, but are capable of monitoring all liquids which move through a pressurized network of pipes.
The PDMS alternate embodiment interface can operate via a wireless network, or be hardwired directly to the WFC. The information relayed between the WFC and LAS Interface includes real time water flow information, present operating conditions, alarm information, manual functions such as turning the water off or disarming the LAS system. In addition to these features the PDMS interface can transmit leak information, wasteful water practices or take commands from a cell phone application. The PDMS alternate embodiment Interface also provides the user with information which can be used to conserve water.
The Home and Away Modes represent maximum time limits which standard water flow can be used in conjunction with the occupancy status of the property being monitored. When the tenant leaves the structure, the Away button (2-3 minutes) is pressed. When the occupant returns, the Home button (20-30 minutes) is pressed. Each of these functions tells the PDMS alternate embodiment of the predicted water demand inside of the designated time period. In the Away mode, we know that water demanded will be significantly lower; therefore the PDMS will associate large water demand over a short time span as a possible leak, rather than standard use. In the Home mode the opposite is true, the PDMS alternate embodiment is expecting the tenant to initiate water usage, and expecting that usage to last significantly longer.
The PDMS preferred embodiment does not have a Home and Away mode. Instead, the DAU can be programmed to alert the water utility of continues usage lasting for an amount of time greater than that specified by the utility. The utility will have several options on how to deal with an alert, from a phone call to the building being monitored, to precautionary measures being taken, which may include remotely shutting off the water.
The Home and Away modes are each associated with a programmable timer; typically the time associated with the Home mode is 20 to 30 minutes, and the Away mode, 2 to 3 minutes. Should these specific times be exceeded, the alarm will trigger, the PV (Primary Valve) will be closed, and the associated leak would stop. See “Interface” for further details on the functionality of the Home and Away buttons.
The differences between the two embodiments are minor. Each functions via logic which is virtually identical to its counterpart. The difference between the two units is primarily what is done with the information received:
The X and Y time parameters represent programmed amounts of time which determine what action will be taken in association with the total amount of time the WFC piston took to travel from S1 (Sensor 1) to S2 (Sensor 2). The total time variable between S1 and S2 is referred to as T1 Time. The amount of water displaced between the home position, A1 (just prior to S1) and S2 is equal to 1/20th of a gallon, or 1 cycle. These T1 time values will fall into one of three time categories: less than X seconds, greater than X but less than Y seconds and greater than Y. The amount of time assigned to X and Y can be adjusted by the customer or utility, but are preset to the following values, X=30 seconds and Y=24 minutes. The PDMS preferred and alternate embodiment uses T1 time in comparison to the value of X and Y, and in turn, assign the appropriate logic sequence, the lower the T1 time, the higher the flow rate.
The WFC associated with the PDMS preferred embodiment may be smaller in diameter and longer in length, and not necessarily equal to 1/20th of a gallon. This amount will change with the diameter of the main water line.
The phases of operation associated with the PDMS preferred and alternate embodiment are programmed to evaluate the type of water flow entering the structure. By doing this, it can accurately assess how to respond to conditions associated with each type of flow. There are 5 phases of standard operation and 4 non-standard phases of operation. Each standard phase is directly associated to the assigned logic mode of the PDMS preferred and alternate embodiment.
Standard Phases of Operation:
Non-Standard Operation:
Evaluation Mode T1 (Time Determination)
In the Evaluation Mode, the primary valve (PV) is closed (reference
The PDMS preferred and alternate embodiment always begin their water monitoring sequences from the Evaluation Mode. Once water use has stopped inside the structure, or fallen below a flow rate designated by X (thus closing the PV or Primary Valve) the PDMS will return to this mode and continue the monitoring process.
The Assessment of T1 Time
T1 time is determined by measuring the time variable of the WFC piston between S1 and S2. This is a function of the Evaluation Mode. Example: Should any kind of water use take place inside the structure being monitored, be it a small leak, large leak, or standard water use, water will flow in order to feed the source of that demand, this water must come from the WFC, as the PV is closed. The WFC Piston inside the cylinder will move away from its home position (A1). The speed at which the piston moves away from A1 is directly related to the flowrate of the water being demanded. As the piston moves forward, the position of the piston is monitored by 3 sensors (3 sensors in the alternate embodiment, 3 or more sensors in the primary embodiment), S1, S2 and OR1 (if necessary). When the piston reaches S1, a timer begins (this is the start of T1 time). As the piston continues forward, the second sensor (S2) will be triggered (this is the end of T1 time). When S2 is triggered, the appropriate logic will be assigned to the occurrence through the following steps.
The cycle begins again.
Recorded Small Leak (Greater than Y Time 24 Minutes)
Recorded Small Leak logic represents a flow of roughly 1 drip every 2 seconds or slower. It is a value which is adjustable by the customer. When drip rates are very low, the responsible party may choose a point at which to alarm. By increasing the value of Y, the alarm will activate for a slower drip rate, a decrease in Y value will cause the alarm to activate at a faster rate. The baseline Y rate is 24 minutes, this equates to roughly 1 drip per 2 seconds.
In Recorded Small Leak logic, when the piston reaches S2, the PV will open, allowing the WFC to equalize in pressure and the piston to return to the home position (A1). At the end of 5 seconds, the PV will close; redirecting the low flow water demand back to the WFC and the Recorded Small Leak cycle will be counted (when this count reaches 5, the Alarm logic will activate for the PDSM alternate embodiment).
Small Leak Flow (Between X and Y Time or 30 Seconds and 24 Minutes)
The cylinder moves forward off of its home position (A1), at S1, T1 time begins, at S2, T1 time stops. If T1 time is greater than X time, but less than Y time, the PV will open for 5 seconds, returning the piston to its home position, and a cycle will be counted and assigned to Small Leak Flow (when this count reaches 3, the Alarm logic will activate for the PDSM alternate embodiment).
In relation to the PDMS alternate embodiment, once Small Leak Flow logic has been assigned, each time S1 and S2 are triggered, the amount of water displaced is recorded (this amount of water is equal to the cycle count multiplied by 1/20th of a gallon) and the flow rate is calculated (as it took T1 time to move from S1 to S2). Once the piston reaches S2 on the 3rd (or more) cycle, the total amount of time the three cycles took, plus the total amount of water leaked into the structure will be displayed on the PDMS alternate embodiment interface. After 3 (or more, depending on the set up) cycles, the invention would consider this to be a leak condition and the Leak Alarm logic sequence would begin. Relative to the PDMS preferred embodiment, the sequence of events is identical to the PDMS alternate embodiment, only the information is now recorded by the DAU and relayed to the water utility via the AMR. Depending on how the utility has set up the meter, the utility will determine the course of action to be taken to inform the tenant of the leak condition.
Standard Use Leak and Max Continues Flow Times
For the PDMS alternate embodiment, the action taken when a Standard Use leak condition (A T1 time of less than X time, 30 seconds) is detected, is directly associated with the Home or Away time of 2-3 min Away, or 25 to 30 minutes Home. At the expiration of these times, Leak Alarm logic will be entered.
The PDMS preferred embodiment uses a single time length (not Home or Away); this amount of time is determined by the utility. At the expiration of this time, Leak Alarm logic will be entered, recorded by the DAU and reported to the utility via the AMR. The water flow can be automatically shut off by the DAU (if so programmed), or the utility can monitor the situation and determine the course of action to take, be it a phone call to the property, or remotely turning off water. It is important to note, that Standard Use leak detection does not count cycles.
Water Meter Closing the Primary Valve
Once Standard Use Flow logic has been assigned, and the PV opens, the point at which the PV closes, becomes a function of the water flow measured by the water meter. Once water flow drops to the water meters lower range of detectability (plus 10%, referred to as X-Flow), the water meter will signal the PV to close, and the Evaluation Mode will be entered. The water meter communicates flow information to the PDMS alternate embodiment interface through a digital or analog connection (or directly to the DAU through a digital or analog connection for the PDMS preferred embodiment). The Water Meter will command the PV to stay open as long as the water flow is greater than X-Flow. Should water demand stop, or fall below the value of X-Flow the flow meter logic would close the PV, the system would return to the Evaluation Mode and T2 time would be reset to zero.
Measuring T2 Time
T2 measures the amount of time that the PV is open. As soon as the PV opens, T2 time starts, and as soon as the PV closes, T2 time resets to zero. T2 time is used to measure time values associated with the Home and Away mode for the PDMS alternate embodiment and Max Continuous Flow time for the PDMS preferred embodiment. When the Home, Away or Max Continuous time values are reached, the system will alarm.
Exceeding Standard Use Home or Away Time (PDMS Alternate Embodiment) When the PDMS alternate embodiment is monitoring Standard Use flow through the water meter, and Home or Away time has been exceeded, (the expiration of Home or Away time, which is equal to a T2 time of 2-3 min Away or 20-30 min Home) and during this period of time, the flow rate does not reduce to a value less than X-Flow, then the PV will close and Alarm Logic will be begin.
Exceeding Standard Use Max Continuous Flow Time (PDMS Preferred Embodiment)
When the PDMS preferred embodiment detects Standard Use flow, and the max continues run time set by the water utility has been exceeded, (the expiration of T2 time), and during this period of time, the flow rate does not reduce to a value less than X-Flow, then the PV will close upon the expiration of T2 time (relative to the time established by the utility) or, the utility will be notified of the high flow leak condition and the valve will remain open, action taken is decided upon by the utility. T2 time is used by the PDMS preferred embodiment to measure the total amount of time that has transpired between the opening of the PV and the expiration of time preset by the water utility. T2 time begins when Standard Use logic is assigned and the PV opens.
X-Flow and X are defined as follows:
Leak Alarm Criteria (Applicable to the PDMS Alternate Embodiment)
Leak Alarm logic will activate when the following criteria are met in any category (Small Leak Flow, Recorded Small Leak Flow and Standard Use).
If these conditions are met, the following Leak Alarm actions will take place:
In the PDMS alternate embodiment, once the alarm sounds and the PV closes, the piston will move away from A1, forward until the full length of the cylinder is reached, and stop. Alarm logic will advise the PDMS alternate embodiment not to open the PV upon reaching S2.
Once the PDMS alternate embodiment has entered the Leak Alarm logic sequence and activated the alarm, the system can only be reset by physically interacting with the PDMS alternate embodiment interface. The following are the options the tenant would be presented with on the PDMS interface. They will be discussed in detail under “Non-Standard Operation”.
Leak Alarm Criteria (Applicable to the PDMS Preferred Embodiment)
Leak Alarm Logic will activate when the following criteria are met in any leak category (Small Leak Flow, Recorded Small Leak Flow and Standard Use). It is important to note that the number of cycles which trigger the Alarm Logic, AND the action that the system will automatically take, are defined by the water utility. The action taken may consist of only reporting the leak scenario, and not closing the primary valve.
If these conditions are met, the following Leak Alarm actions will take place:
In the PDMS preferred embodiment, once the alarm condition is recorded and the PV closes (if so elected by the utility), the piston will move away from A1, forward until the full length of the cylinder is reached, and stop, thus stopping all water flow into the building being monitored. Once the PDMS preferred embodiment has entered the Leak Alarm logic sequence, and if the utility has chosen to take automatic action by closing the PV, the valve can subsequently be remotely re-opened through a command from the governing utility, via the AMR.
Override Sensor (OR1 Sensor)
If the PDMS preferred or alternate embodiment has detected a leak, and the piston is between S1 and S2, the wrong logic sequence can be assigned should a valve be opened inside the structure being monitored while the leak event is occurring. The OR1 sensor prevents this possibility, by measuring the time it takes the piston to travel from OR1 to S2. Should this time be under 2 seconds, the PDMS will proceed directly to Standard Use Logic, even if T1 time demands a different logic assignment.
The Override sensor is located of an inch prior to S2. Should a valve be turned on inside the structure, during which time the piston is monitoring a low flow condition, the piston will suddenly move forward at a faster rate, cross the OR1 Sensor (Starting Override Time) and continue to S2. At S2 both OR1 Time and T1 time stop. If OR1 Time is less than 2 seconds, it will supersede T1 time and Standard Logic will be used for the water use event.
Non-Standard Modes of Operation
In conjunction with the PDMS alternate embodiment, the individual or institution responsible for monitoring the property may find it necessary to interact with the invention in a fashion other than pressing the Home or Away buttons. The following two buttons and guarded switch serve a specific purpose and are not a part of the inventions standard use:
Interface—Liquid Crystal Display (LCD) (PDMS Alternate Embodiment Only):
Buttons on the PDMS Alternate Embodiment Interface:
LED Lights on the PDMS Alternate Embodiment Interface:
Guarded Switch on the PDMS Alternate Embodiment Interface:
Assembly of the PDMS preferred and alternate embodiment (instructions describe the dimensions related to a ¾ in pipe)
Testing PDMS Preferred and Alternate Embodiment:
The PDMS preferred or alternate embodiment is coupled into a testing rack, the PV side of the PDMS is connected to a pressurized water source. The opposite end is connected to a valve.
Recorded Small Leak Flow Test:
This test confirms the system's ability to reset itself to the Evaluation mode should the piston move forward across S1 and S2 in a time greater the value of Y. The valve is set to a drip cycle that is less than a flow rate of approximately 1 drip per 2 seconds. A timer is started and the cylinder moves across S1 and S2. The PDMS measures a time of 24 plus minutes (or a time designated by the user). The PV opens, and the PDMS preferred or alternate embodiment returns to the Evaluation mode and 1 cycle is counted.
Small Leak Flow Test:
The PDMS alternate embodiment interface is preprogrammed to alarm after 3 cycles. For testing purposes, the DAU preferred embodiment is also programmed this way. The valve is turned on to a drip rate which produces a Y time of less than 24 minutes, but more than an X time of 30 seconds. The piston begins movement from A1, once the piston reaches S2, the PDMS system is checked to confirm the following:
Standard Use Flow Leak Test:
Override Sensor Test:
Reference the PDMS preferred or alternate embodiment. Open the valve on the test stand to a value which will allow the piston to reach S2 in a time greater than X (3 minutes for example). When X time (30 seconds) is reached, fully open the valve. The Override sensor should detect the time value between the OR1 Sensor and S2 as being less than 2 seconds, command the PV open, and assign Standard Use Flow logic to the scenario.
Alarm Test:
At the end of three test events (The Small Leak Flow test, Recorded Leak Flow test and the Standard Use Flow leak test), the PDMS preferred and alternate embodiment should enter Alarm logic. Alarm logic is confirmed at the end of each test. At which time the PDMS alternate embodiment Interface Reset/Silence button is checked, or the PDMS preferred embodiment Interface DAU recording/reporting features are checked.
PDMS Alternate Embodiment Interface Test:
At the completion of the PDMS preferred and alternate embodiment WFC Alarm test, the functionality of the interface will be checked.
Calibrating the PDMS Preferred and Alternate Embodiment:
The PDMS preferred and alternate embodiment must be calibrated to the specific water meter attached to the invention. The PDMS will produce an accurate result with any type of water meter attached to it, however it must be calibrated in order to achieve this high degree of accuracy. Calibration is completed on the test rack with the leak valve closed. it can also be completed in the field.
Alternate Water Flow Route
A variation of the PDMS WFC is applicable to both embodiments. In the PDMS preferred and alternate embodiments, when the piston reaches S2, the PV opens and pressure on the forward and aft side of the piston is equalized, allowing the spring to push the piston back to its A1 position. Alternatively, a separate pipe connecting the inflow endcap to the outflow endcap, with a solenoid valve placed on this pipe could be used to equalize pressure, and allow the piston to return to the A1 position. The addition of this pipe would eliminate several of the calibration steps previously mentioned, and would allow water to flood the opposite side of the WFC without passing through the water meter.
Attaching the PDMS WFC alternate embodiment to the main water line:
Sub-Freezing Temperature Installation of the PDMS Preferred or Alternate Embodiment:
Wiring the PDMS Alternate Embodiment to the Interface.
Powering the PDMS Preferred and Alternate Embodiment.
There are several different power supply options. These include hard wiring the PDMS preferred and alternate embodiment, solar power, and battery power.
Testing the PDMS Preferred and Alternate Embodiment after Installation:
Note: After the PDMS preferred embodiment is installed, the technician will run similar tests as described below, however because the PDMS preferred embodiment does not have an interface, these tests are completed using a handheld display which plugs directly into the DAU.
Once the PDMS alternate embodiment is installed, it will be tested. Start by turning water to the property on with the PV closed. The position of the PV can be controlled by selecting Water Off on the interface, check for leaks. Next, lift the guard and move the PDMS Off/Water On switch to the “ON” position. This will allow water to flow into the house and flood the upstream side of the WFC (make sure a valve is open inside the property, this will allow air in the water pipe network to escape). Once the pipes are flooded, check the system for leaks. Next, turn the PDMS Off/Water On switch off. The green Home light should illuminate, the PV will close, and the property is now being monitored.
Note: If the WFC is installed for cold weather operation, when the PDMS alternate embodiment Off/Water On switch is turned off, air may still be trapped inside of the downstream end of the WFC. To remove the air, the piston must be actuated a second time. Do this by pressing the Water Off button and opening a facet inside the monitored property. This will move the piston forward, forcing the air into the primary water line. Next, press and hold the Silence/Reset button for 5 seconds, this will open the PV and eject the air out of the facet and return the system to the Evaluation mode.
Abnormal Operation:
Manual Operation of the Primary Valve:
Should the PDMS preferred or alternate embodiment fail, or 120 VDC power AND the back-up battery fail there is a high degree of likelihood that the PV will be closed. If this is the case, water will stop flowing to the property and the valve must be operated manually. To operate the valve manually, go to the PDMS WFC and locate the PV. On the top of the valve is a small cylinder, it is directly attached to the valve. Pulling up on this cylinder will latch the valve to the open position, and will start the flow of water to the property. At this point, the property will not be safe from water leak damage, and rates of flow below the water meters range will not be directed to or recorded by the WFC. Standard flow rates and volume within the water meters range will continue to be recorded.
Water Conservation:
Both the PDMS preferred and alternate embodiment can contribute toward using water more efficiently. Because each unit reports to different end users, the role each unit plays in water conservation are unique to its counterpart.
Water Conservation and the PDMS Alternate Embodiment
The PDMS alternate embodiment can display the total amount of water used in coordination with a property owner's monthly water average, or allotment. The middle LCD will display the total amount of water that has passed into the property since day one of the billing cycle and the bottom LCD will display the percentage of water remaining before a water usage target is reached (this may be an amount of water in relation to maximum usage limits prescribed by the utility). This feature allows the customer to gain the upper hand on water usage, as knowledge of excessive water usage will avoid cost overages and deter wasteful use of a resource that is becoming increasingly more valuable.
Water Conservation and the PDMS Preferred Embodiment
The PDMS preferred embodiment can be used to alert the water utility to wasteful water practices produced by their customers. The PDMS can be programmed to alert for ongoing high flow sceneries, such as filling a swimming pool or prolonged sprinkler use. The wasteful water practices described could then be followed up with a phone call, or letter of warning in the customer's water utility bill. Additional income to the utility could also be created when these practices are identified, as using water in violation of rules set in place by state or local officials can be cause for an increase in billing.
Options for Communicating with Off Property Parties and Remote Operation (PDMS Alternate Embodiment):
The PDMS alternate embodiment can communicate through a 3G connection from the user interface. It can transmit water flow information to off property individuals, such as a property manager, landlord or property owner. Additionally it gives the user the ability to control the PDMS interface through the PDMS internet application. The transmissions can come in the form of an email alert, or read directly from the PDMS application, advising the responsible property of a water discrepancy. Information that can be relayed and actions that can be taken are as follows.
Actions:
1) Activation of the Home mode
2) Activation of the Away mode
3) Activation of the PDMS alternate embodiment Water Off mode
Information Transmitted:
The foregoing has outlined rather broadly the more pertinent and important features of the present Positive Displacement Metering Systems in order that the detailed description of the application that follows may be better understood. This would allow the present contribution to the art to be more fully appreciated. Additional features of the design will be described hereinafter which form the subject of the claims of this disclosure. It should be appreciated by those skilled in the art that the conception and the disclosed specific embodiment may be readily utilized as a basis for modifying or designing other structures and methods for carrying out the same purposes of the present design. It should also be realized by those skilled in the art that such equivalent constructions and methods do not depart from the spirit and scope of this application as set forth in the appended claims.
The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments of the preferred and alternate embodiments of the Positive Displacement Metering Systems and together with the description, serve to explain the principles of this application.
For a fuller understanding of the nature and advantages of the PDMS in the preferred or alternate embodiment systems, reference the following detailed description taken in conjunction with the accompanying drawings which are incorporated in and form a part of this specification, illustrate embodiments of the designs and together with the description, serve to explain the principles of this application.
Referring now to the drawings, wherein similar parts of the PDMS in the preferred or alternate embodiments 10A, 10B, 10C, 10D and 10E that are identified by like reference numerals, there is seen in
The PDMS preferred embodiment 10A has additional sensors added to the Water Fill Cylinder Assembly (WFC) 12A, these sensors are placed along the tie rod 30 at a distance of roughly 1 inch apart and are referred to as WM 1 sensor 46, WM 2 sensor 48 and WM 3 sensor 50. T1 time is evaluated each time the piston passes WM 1 sensor 46, WM 2 sensor 48 and WM 3 sensor 50. This time is compiled, totalized and recorded by the data acquisition unit (DAU) along with the cycle count. At no time does water flow through the Water Fill Cylinder Assembly (WFC) 12A.
A larger diameter cylinder is best for higher flow rates.
A smaller diameter cylinder produces a more accurate reading at lower flow rates. The combination of two different diameter cylinders could be used to produce a very accurate system in conjunction with a higher flow rate.
With reference to
With reference to
With reference to
The Positive Displacement Metering Systems 12A, 12B, 12C and 12D shown in the drawings and described in detail herein disclose arrangements of elements of particular construction and configuration for illustrating preferred embodiments of structure and method of operation of the present application. It is to be understood, however again, that elements of different construction and configuration and other arrangements thereof, other than those illustrated and described may be employed for providing a Positive Displacement Metering System 12A, 12B, 12C and 12D in accordance with the spirit of this disclosure, and such changes, alternations and modifications as would occur to those skilled in the art are considered to be within the scope of this design as broadly defined in the appended claims.
Further, the purpose of the foregoing abstract is to enable the U.S. Patent and Trademark Office and the public generally, and especially the scientists, engineers and practitioners in the art who are not familiar with patent or legal terms or phraseology, to determine quickly from a cursory inspection the nature and essence of the technical disclosure of the application. The abstract is neither intended to define the invention of the application, which is measured by the claims, nor is it intended to be limiting as to the scope of the invention in any way.
Cronin, John V., Cronin, William C.
| Patent | Priority | Assignee | Title |
| ER6109, |
| Patent | Priority | Assignee | Title |
| 5056554, | Feb 20 1987 | Fluid loss, damage prevention and control system | |
| 5228469, | Aug 15 1991 | Fluid control system | |
| 6186162, | Jul 06 1999 | Dynaquip Controls Corporation | Leak detection and shut-off apparatus |
| 20140246364, |
| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Date | Maintenance Fee Events |
| Aug 17 2020 | REM: Maintenance Fee Reminder Mailed. |
| Feb 01 2021 | EXP: Patent Expired for Failure to Pay Maintenance Fees. |
| Date | Maintenance Schedule |
| Dec 27 2019 | 4 years fee payment window open |
| Jun 27 2020 | 6 months grace period start (w surcharge) |
| Dec 27 2020 | patent expiry (for year 4) |
| Dec 27 2022 | 2 years to revive unintentionally abandoned end. (for year 4) |
| Dec 27 2023 | 8 years fee payment window open |
| Jun 27 2024 | 6 months grace period start (w surcharge) |
| Dec 27 2024 | patent expiry (for year 8) |
| Dec 27 2026 | 2 years to revive unintentionally abandoned end. (for year 8) |
| Dec 27 2027 | 12 years fee payment window open |
| Jun 27 2028 | 6 months grace period start (w surcharge) |
| Dec 27 2028 | patent expiry (for year 12) |
| Dec 27 2030 | 2 years to revive unintentionally abandoned end. (for year 12) |